Difference between Number Cruncher and Duffer

NUMBER CRUNCHER vs DUFFER: NOUN

Someone able to perform complex and lengthy calculations
A computer that is able to perform complex, lengthy calculations.
A person who performs numerous calculations, especially an accountant.
An accountant or other person who deals with the calculation of numbers as a profession.
A computer capable of performing a large number of mathematical operations per second

An incompetent or clumsy person
An incompetent or dull-witted person.
A casual or mediocre player of a sport, especially golf.
A peddler of cheap merchandise.
Something worthless or useless.
A stupid, dull, plodding person; a fogy; a person who only seemingly discharges the functions of his position; a dawdling, useless character: as, the board consists entirely of old duffers.
A peddler; specifically, one who sells women's clothes.
A peddler or hawker, especially of cheap, flashy articles, as sham jewelry; hence, a sham or cheat.
A stupid, awkward, inefficient person.
See shicer.
Any common domestic pigeon.
One who duffs cattle, etc.
A player having little skill, especially a golfer who duffs.
A pedlar or hawker, especially one selling cheap or substandard goods.
Cheap or substandard goods sold by a duffer.
A cow that does not produce milk.
A cattle thief; one who alters the brands of cattle.
A hawker of eheap, flashy, and professedly smuggled articles; a hawker of sham jewelry.

Programmer, Investment banker, Econometrician, Actuary, Sabermetrician, Mathematician, Dealmaker, Accountant, Prognosticator, Pencil pusher, Spinmeister, Psephologist, Cruncher, Statistician, Wonk

Boffin, Bureaucrat, Wheeler dealer, Programmer, Econometrician, Actuary, Sabermetrician, Mathematician, Accountant, Prognosticator, Pencil pusher, Spinmeister, Cruncher, Statistician, Wonk

But I am a writer, not a number cruncher so any help would be eternally appreciated.
As a young number cruncher this is a worthy goal.

In his Sunday Star-Times column he classed himself as "a dancing duffer", and he did not survive the third episode of the competition.
Weather your a weekend duffer or professional player we have a large selection of new and used golf balls for every player.
Two of them, dressed like Harvard seniors, caps and striped duffer jackets, came up to the crate I was dining off.
In two staggering sessions, the solitary breakthrough was made by a duffer whose offerings were not given their due.
Along the same line, the Duffer brothers have teased a different tone this time around.
Duffer Brothers, Shawn Levy and the Hawkins crew are on the other side from.
Some duffer in there; some one pushed out to the front.
Last week, a lawsuit was filed against the Duffer Brothers by filmmaker Charlie Kessler.
Duffer teaches AP Economics at Buffalo Grove High School in Illinois.
Demand, Pink Soda, and The Duffer of St George.